Back in October I asked a question about multipathing in z/Debian. I've since 
resolved my problem with getting the multipathing device definitions to hold 
across an IPL, but now I'm having trouble booting with root mounted on a 
multipathed, LVM'd volume on z/Debian. It appears to be within the order of 
things. Of course, multipathing should come first, then LVM, then the mounting 
of root, but what I always get is the message "mounting root on 
/dev/mapper/system-ROOT" (in other words, I've coded /etc/zipl.conf correctly), 
then unable to find volume group "system", then it drops into initramfs. I try 
to issue a "vgchange -ay system", but it can't find the volume group "system", 
nor can it find the multipath'd volume (/dev/mapper/mpath0 or mpath1) to use as 
its PV's.

ALERT! /dev/mapper/system-ROOT does not exist. Dropping into shell!

cat /proc/cmdline
root=/dev/mapper/system-ROOT ro rootdelay=10 BOOT_IMAGE=0

cat /proc/modules
dasd_eckd_mod
zfcp
scsi_transport_fc
scsi_mod
dasd_fba_mod
dasd_mod
dm_multipath
dm_snapshot
dm_mirror
dm_mod

How do I get my multipath definitions and LVM configuration to run before root 
is mounted?

Mark Wiggins
University of Connecticut


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